Reviewed by Darin Adler.

    Reviewed by Darin Adler.

        <rdar://problem/5511128> Crash closing or reloading this SVG

        * dom/ContainerNode.cpp:
        (WebCore::dispatchChildInsertionEvents):
        (WebCore::dispatchChildRemovalEvents):
        Use DocPtr instead of RefPtr, since these events are dispatched
        when the Document is being being torn down by removedLastRef().

        * dom/DocPtr.h:
        (WebCore::DocPtr::DocPtr):
        Fix longstanding typo in template so that the DocPtr(DocPtr) constructor can be used.

        * dom/Document.cpp:
        (WebCore::Document::Document):
        (WebCore::Document::removedLastRef):
        * dom/Document.h:
        (WebCore::Document::selfOnlyRef):
        (WebCore::Document::selfOnlyDeref):
        * platform/Shared.h:
        (WebCore::Shared::Shared):
        (WebCore::Shared::ref):
        (WebCore::Shared::deref):
        (WebCore::Shared::hasOneRef):
        (WebCore::TreeShared::TreeShared):
        (WebCore::TreeShared::ref):
        (WebCore::TreeShared::deref):
        (WebCore::TreeShared::hasOneRef):
        (WebCore::TreeShared::refCount):
        Add debug-only checks for a document being ref-counted while being deleted.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@25797 268f45cc-cd09-0410-ab3c-d52691b4dbfc